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The potential of mechanical twinning in ultrafine retained austenite to enhance high cycle fatigue property of advanced bainitic steels
International Journal of Fatigue ( IF 6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ijfatigue.2020.105804
Guhui Gao , Kun Wang , Hao Su , Xiaolu Gui , Zhi Li , R.D.K. Misra , Bingzhe Bai

Abstract We have studied here the high cycle fatigue properties and sub-surface fatigue crack initiation mechanism in advanced bainitic steel subjected to conventional bainitic austempering (BAT) and novel “disturbed” bainitic austempering (DBAT) processes. The retained austenite in DBAT steel mainly exhibited ultrafine film-like morphology, whereas a considerable amount of coarse blocky retained austenite was present in the BAT steel. The study indicated that the DBAT steel had higher fatigue strength and endurance, compared to the BAT steel. The enhanced fatigue properties are attributed to mechanical twinning that occurred in film-like retained austenite at the sub-surface fatigue crack initiation area.

中文翻译:

超细残余奥氏体中机械孪晶增强高级贝氏体钢高周疲劳性能的潜力

摘要 我们在此研究了经过常规贝氏体奥氏体淬火 (BAT) 和新型“扰动”贝氏体奥氏体淬火 (DBAT) 工艺的高级贝氏体钢的高周疲劳性能和亚表面疲劳裂纹萌生机制。DBAT钢中的残余奥氏体主要呈现超细膜状形态,而BAT钢中存在大量粗块状残余奥氏体。研究表明,与 BAT 钢相比,DBAT 钢具有更高的疲劳强度和耐久性。增强的疲劳性能归因于在亚表面疲劳裂纹萌生区发生在薄膜状残余奥氏体中的机械孪晶。
更新日期:2020-10-01
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